Natural Color Octagon Tanzanite Gemstone 2.67 CaratsOne 2. 67 carats octagon tanzanite, natural color, FLAWLESS TO VVS clarity, cut grade excellent, measuring 7 mm wide, 9. 6 mm long, 5. 3 mm deep; with excellent polish and excellent symmetry. The proportions of the tanzanite are as follows: total depth 75. 7%, table width 48. 6%. The estimated overall quality rating of this tanzanite if heated is 956 out of 1000.